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Subsequent Events (Details) - Ipsen Collaboration - Collaboration Arrangement - Subsequent Event
$ in Thousands
Jul. 30, 2021
USD ($)
agreement
Subsequent Event [Line Items]  
Number of collaboration programs | agreement 2
Non-refundable upfront payment received for research agreement $ 20,000
Pre-clinical milestone payment amount 5,000
Development and regulatory milestone payment amount 180,000
Commercial milestone payment amount 762,000
Collaboration agreement, licensing fees incurred 3,000
Option Exercise Period after the Selection  
Subsequent Event [Line Items]  
Collaboration option exercise fee 10,000
Option Exercise Period that begins after the first Option Exercise Period  
Subsequent Event [Line Items]  
Collaboration option exercise fee $ 25,000